Final answer:
You cannot form a square, triangle, circle, or hexagon by attaching two right triangles to a rectangle. Additional information is needed to accurately determine the shape of the patio described.
Step-by-step explanation:
The question asks about the shape of a patio that is created by combining a rectangle with two right triangles of equal size attached to it. If the right triangles are attached to one of the longer sides of the rectangle, their combined shape will form a larger rectangle (if the triangles are half the width of the original rectangle) or a trapezoid (if the triangles are a different width). However, neither squares, circles, nor hexagons are created from this description.
Therefore, based on the shapes provided as options, none of them accurately describe the patio's shape given the described configuration. To best assist with this problem, we would need a clearer description or more information about how the triangles are attached to the rectangle.